Table 4.

Validity of COMDQ ^α in terms of variables under study

Variables	Number	Mean ± SD	Pearson’s correlation	P-value
Duration of the disease
Aphthous      Lichen planus      Pemphigus vulgaris and mucous membrane pemphigoid	135	9.25±2.93 8.03±2.74 8.53±3.06	0.320 0.453 0.336	P<0.001
Disease severity
Aphthous stomatitis      Lichen planus      Pemphigus vulgaris and mucous membrane pemphigoid	40 40 15	29.40±9.26 16.10±10.17 21.60±12.69	0.866 0.909 0.941	P<0.001
Pain severity
Aphthous stomatitis      Lichen planus      Pemphigus vulgaris and mucous membrane pemphigoid	40 40 15	6.15±2.78 4.23±2.66 5.27±2.12	0.622 0.969 0l852	P<0.001

^α: Chronic oral mucosal disease questionnaire